期刊
PHYSICAL REVIEW B
卷 82, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.82.195313
关键词
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资金
- Cornell Center for Nanoscale Systems (CNS) through National Science Foundation [EEC-0646547]
- National Science Foundation [DMR 0520404, DMS-0935165]
- Nano/Bio Interface Center through the National Science Foundation (NSEC) [DMR08-32802]
A theory of the electronic-structure and excitonic absorption spectra of PbS and PbSe nanowires and nanorods in the framework of a four-band effective-mass model is presented. Calculations conducted for PbSe show that dielectric contrast dramatically strengthens the exciton binding in narrow nanowires and nanorods. However, the self-interaction energies of the electron and hole nearly cancel the Coulomb binding, and as a result the optical absorption spectra are practically unaffected by the strong dielectric contrast between PbSe and the surrounding medium. Measurements of the size-dependent absorption spectra of colloidal PbSe nanorods are also presented. Using room-temperature energy-band parameters extracted from the optical spectra of spherical PbSe nanocrystals, the theory provides good quantitative agreement with the measured spectra.
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